Either you're old, like me, and were aghast at the idea of someone defiling your beloved Jump Street. Or you're young (i.e., born after the ’87 launch of the TV series that made Johnny Depp a star) and your reaction was closer to, "What's 21 Jump Street?"

Good news, graybeards and whippersnappers: This is a movie we all can dig.

The new Jump Street borrows the same conceit as the old – babyfaced cops go back to high school to narc on naughty kids – but torques it into a ridiculously inappropriate comedy.

The secret is the Mutt-and-Jeff pairing of Channing Tatum and Jonah Hill as the narcs. Tatum is Jenko, the hot cop to Hill's Schmidt, the smart one. They're both stunned when they enroll in school to bust a drug ring, only to find that cliques have changed and Schmidt's the popular one now.